Camera copy and medium for use in preparing same



L. S. SANDERS Feb. 7, 1939.

CAMERA COPY AND MEDIUM F ,OR USE IN PREPARING SAME Filed 36 i. 8, 1956 Patented Feb. 7, 1939 ciples of my being drawn or UNITED s A'ras PATENT OFF-ICE. I CAIWERA corr his $310M Fort use m i v PREPAR GSAME Louis S. Sanders,

8, 1936, Serial No.

Application September 3 Claims.

which may be rendered visible by the application to such surface of a suitable agent. In using,

camera copy, an imfor preparing the surface conupon tainingthe invisible pattern are rendered visible to form a background or shading for such image.

It is a primary object of the present to provide a medium of the aforesaid upon the surface of which an image,

similarly produced, as produced photographically. Another object of the invention is to provide such a medium and a method for using the same which would be capable of substantially reducing the cost and time previously required for making reproductions of combined photographic images and Ben Day or half-tone shadings or patterns. A further object invention character,

described,

m y be of the invention is to provide a method of making or preparing camera copy by the use of such a medium.

To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafterfully described and particularly pointed out in the claims.

The annexed drawing and scription set forth in detail one method and one closed procedure and product ever, but one of various applications of the prininvention.

In said annexed drawing:

Fig. 1 is a view of thesurface of a sheet of drawing board of paper containing a print of 9. Ben Day or half-tone pattern;

Fig. '2 is a view similar to Fig. 1, but in which the pattern has been rendered invisible;

. Fig. 1 is a view similarto Fig. 6, but in which Fig. 3 is a cross-sectional view of the sheet shown in Fig. 2',

Fig. 4 is a view similar to Figs. 1 and 2, but

in which a coating of a light-sensitive emulsionhas been applied to the surface of the sheet;

Fig. 5 .is a cross-sectional view of the sheet shown in Fig. 4;

Fig. 6 15a view but having a photographic print of thereon; an

an image instead of v of the sheet shown in Fig. 4

Lakewood, Ohio the image has been embellished by portions of the Ben Day pattern to provide camera copy.

Referring more particularly to the drawing, there is illustrated in'Fig. 1, the surface i of a sheet of drawing board or paper containing a print a Ben Day pattern, consisting in this case of'a multiplicity of closely spaced tiny dots, lines, stipples or any other similar pattern suitable for backgrounding or shading an image produced on such surface.

This pattern may be produced photographi- No. 1,709,600, may be imprinted on described in Maier et a1. Patent No. duced in any other known manner.

In any event, the image is first rendered inthe use of a bleaching agent, such described in the aforesulphuric acid solution, ent to Maier et al. man A sheet, the surface of which invisible image is illustrated in the drawing. After the rendered invisi sheet i which contains the invisible pattern is coated with a 'uitable light-sensitive emulsion 3, such for example as is commo y used for coating Van Dyke or blueprint paper, such containing in general complex silver compounds and/or iron salts. The sheet of paper thus coated is illustrated in Figs. d-5. This sheet upon which an image, in-

be produced photographically. g

a negative] containing a halftone or the sheet, the sheet and negative are placed in'a suitable contact frame, and sheet exposed to light for a short period, 1. e.,

minutes.

light sensitive emulsion which the exposure are removed from the sheet, as by washing rinsing the sheet in clean water, the image 4, which in this case image of a star, and a background consisting of the original surface I which invisible Ben Day-pattern.

It will be understood that the ing is continued for a period s the image 4 but not sufllcient Day pattern visible. Inst washing or rinscient to develop to render the Ben 2, said surface 5 1,778,397, or may be pro- Ben Day pattern has thus been 25 emulsions 30 or similarly produced, may

to light 45 still contains the so ead of washing or i rinsing in water, any solution may be used which will develop the image 4 but will not render the Ben Day pattern visible.

After the sheet is dried, selected portions or of the Ben Day pattern I therefore particularly point out and distinctly claim as my invention:

1. A medium for 2. The method of preparing camera copy which 

